Andromeda 5x bigger than previously thought.

Chaos' lil bro Order

The article from space.com:
http://www.space.com/scienceastronom...meda_halo.html



I have a question about the article. What do current galaxy formation theories say about why the cores of galaxies like Andromeda have more metal-rich stars than their halos do? I am guessing that the halo stars slowly get drawn into Andromeda's central black hole and as a result, they coalesce into stars that are then capable of the fusion reactions and eventually the supernovae that are capable of creating metals, is this close?

quantum123

So does it still need any dark matter?